Vacuum tube base and receptacle



im@ i12, 1923.

F. H. SHAW VACUUM TUBE BASE AND RECEPTACLE Filed Aug. 20, 1919 reninintegree.

y @einen erntet retenir-1ernten I' 'eliminen nini im et, ieie. terni n.tienes. i

Fig. 8 isa section on the line 8 8 et gig-9 is an enlarged deteil of theinterloch between the insulating-part of the re- ToalZwhmn/e'tmaycmwem:i M it tmovvn that ll, FnANir H. SHAW, n citizen of the United States,residing Vet East Orange, New Jersey, have invented e certain new anduseful. lmrovements in Vacuum Bases and iw- ...of which the following isa clear, full, and ex.

act description.

vention relates to bases or recep- 10 tecles tor electrical apparatus,and a neral ohjefct ot the' invention is to provi e e hase orreceptaclewhich will better meet the varied conditions of use to whichsuchstructures are now 'frequently subjected, T particularly whenutilized in connection with-radio telegrap'happaratus, or with theelectric or radio equipment of airplanes, with the consequent subjectionto marked chi. fr in teinmrature and in atmospheric ai .h particularobject of the invenh'oiiiv is the @induction cfa hase or rece tacle ha:e closure of insulating materia molded un er into air andmoisture-proof lit in se one end of the metallic -shell ot Whichthepartly formed and also molded into iz-11..; relation to ope through Midshell adjacent to, the seid en @their objects' andimportnnt n of theinvention will a pear from the tolle ving description an claims whencons idered in connection .with theaccoinpanying drewinge in Which- Fig.l is a sectional view on the line l l, Fig. 3, through a base for avacuum detector tube provided with a tour point contact;

' Fig. 2is a sectional view on the line 2 2,

Fi 4l, through a hase similar to that shownv ingFig. l, hut having oneof the contactsgtiundedfm'ilsejwithdtlllwreq y e three point eontect;

view ot the clpilacle shown in Fig. 8 and the. metallic S e s Fig. l0shows the manner in which e hw of the type shown in Figures 1 or 2 isconnected to the vacuum tube oi a radio detector.- l'The hase, whichconstitutes the siihject matter of the Ypreeeiiit invention, isparticu;--

larly'adapted for use with vacuum tubes such as are. employed' withincandescent lamps and is herein shown inFig. 10 as eni- .ployed with adetectorituhe constituting a part of a radio telegraph outlit of thetype commonly employed with airplanes. These incandescent lamp detectorscommonly lieve three or ic'oiir terminals according to the type ofdetector( employed and therefore two types of hase are provided, thatshovvnA in Figs. 1 and 3 having tour terminals, and that shown in Fi 2and 4 having one of the four' termin grounded se that there are onlthree effective terminels.

` The e comprises eesentiall a metallic shell i?.` having an inturnedhoo -like @iwan-J 4t adapted to `constitute anchorage for nl cement 5 hywhich the vacuum tube is locked tothe hase. One end of the shell isclosed hy a closure of insulatin material, preterahly material which wistand relatively great variations intempemture and atmes pheiicconditions, for example, halrelite, condensite, or vother phenoliccondensation product, and this closure is preferably' molded intoposition under heevy pressure so that it will absolutely dll the openend of the shell and have an air and moisture proof fit in said shellend. Fig. 3 isa 'bottoni planview" oi the hase 'lhe illustrated closure6, which is preterahly of some phenolic condenmtion product,

is locked. in position in the shell hy nieensof radial lugs orprojections 8 formed' in the molding operation-hy Ydirecting e'component of the molding pressure laterally so that sonic of theinsulating composition is ice forced out thron' h the openings l0 in theshell 2. The m e of i". i "the closure d band the lugs 8 is tullydescribed and illustrated in my io-pending application Seriell No.575,@2 tiled duly 18, 1922, for Letters Patent for improvements in pMeer, of mahin bases and receptacles for vacuum tubes.

A so brought into air and moisture proof relation to closure 6 by themolding operation, and locked in position in said closure, are terminals12 for the filament and for ythe conductors of the incandescent lampdetector. The terminals 12 are preferably provided With a burred surface14 u'pon that part of each which is locked in the closure 6.

From an inspection of Figs. 1, 2, 5, 6 and 10,'

it will be noted that there is preferably formed on the closure 6 ashoulder 16, and that thatpart of the closure 6, in which the terminals12 are locked,is preferably of such thickness that the inner ends ofthese terminals are substantially Hush with the inner surface of thatpart of the closure 6. The shoulder 16 is not only an importantstructural feature of the base but the provision of this shouldercontributes to the successful molding of the linsulation in air andmoisture proof fit in the shell end and also to the formin of the lugsor radial projections 8 for die interlocking of the closure with theshell.

In order to form a three terminal socket, four terminals are preferablymolded into position in the closure 6, but one of the terminals isgrounded upon the shell of the socket.l rlhis grounding is ei'ected in anovel manner, more fully shown in Figs. 2 and 4 of. the drawings. Froman inspection of these figures, it will be noted that the terminal to begrounded is provided with an enlarged head portionv 49 which joins theexposed part of the terminal through fa tapered shoulder 51. A contactstrip 53 bent into rectangular shape has one leg extending along theinner Wall of the shell 2 and the other leg providedvvith an opening ofsubstantially the diameter of the outer part .j of the terminal 12having the enlarged head 49 and shoulder 51, this opening being slippedover the exposed part of said terminal and into contact With theshoulder 51. During the molding operation, the action of the male andfemale molds forces the shoulder 51 and the opening in the angular piece52 into close fitting relation to each other, the horizontal part ofsaid angular piece being embedded in the closure 6 and thus brought intoflush relation to the lower surface thereof. By spot Welding orsoldering the vertical part of the contact strip 53 to the inner face ofthe shell, an effective grounding of one of the terminals is obtained.

B forcing the insulating material, which, as a ove suggested, ispreferably a phenolic condensation product, under pressure into closefitting relationl to a smooth c lindricall shell surface and byinterlocking the shell and the insulation by causing projections to beforced by the molding pressure mesita nection with radiotelegraphvequipment for l airplanes.

What I claim as new is:

1. A base for a vacuum tube or other electrical apparatus, comprising ashell having a cylindrical end and having molded intov air and moistureproof fitin said cylindrical end, under pressure, a closure ofinsulating' material, said shell having openings through the shell Walladjacent to said clo' sure, and said closure and said shell beinginterlocked by individual radial projections from said closure moldedunder pressure into said openings.

2. A base for a vacuum tube or other electrical apparatus comprising ashell, an insulating closure formed of material having the generalphysical characteristics of a. phenolic condensation product moldedunder pressure into sealing relation to one end of said shell, saidshell having openings therethrough adjacent to said end, and saidclosure having integral individual radial projections molded intointerlocking relation to said openings.

3. A base for a vacuum tube or other electrical apparatus, comprising ashell, ya closure of insulating material molded, under pressure, intoair and moisture proof fitl in one end of said shell, saidshell havingopenings therethrough adjacent to said closure, and said closure havingintegral individual radial projections molded under pressure intointerlocking relation to said openings, and terminals carried by saidclosure and said closure being also molded under pressure into permanentair and moisture proof relation to said terminals.

4. A support for a vacuum tube or other electrical apparatus, comprisinga shell, an insulating mounting for terminal posts formed of materialhaving the general physical characteristics of a phenolic condensationproduct molded under pressure into close fitting engagement with saidshell at one end thereof, said shell having individual radial openingstherethrough and said insulating support having integral projectionsmolded into interlocking relation to said openings, and terminal postsmolded into permanently interlocked relation to and tion 1n saidinsulating material, and means intenta for: grounding one of saidterminals oomprising a metallic strip having an eye embracing saidterminal, said strip being molded into embedded position in said insure,a closure of insulating material, *saidy shell having openings in theshell Wall adjant to said closure. and said closure and said shell beinginterlocked by individual radial projections molded under pressure intosaid openings.

'l'. A. hase for a vacuum tube or other electrical apparatus, comprisinga cylindrical shell having one end provided with an inurned marginreducing the opening at that end and having` molded into air andmoisture proof fit in the other end, under pressure, a closure ofinsulating material, said shell having openings in the shell walladjacent to said closureT said closure and said shell being interlockedhy individual radial projections molded under pressure into mid ma annaar@ tang primaat wi shoulder at least partly opmd to h said radialprojections 8. A hase lor avacuum tube or. other electrical appamtuscomprising a cylindrical shell inturned at one endto form a looming lange, an insulating closure molded under pressure into sealing relationto the other end of wid shell, said shell having opensaid end, and saidings therein adjacent to closure having nn individual radial projectionsmold@ int/o 1'interloching relai tion to wid openings and heingvprovided with a dhoulder along its inner margin.

9. A hase/lor a vacuum tuhe or other electrical a paratus corn p risingashell having a cylinrical end an having an insulating closure moldedunder pmure into air and moisture proof ht ,in said cylindrical end,said shell having openings therethrough adjacent to said end, and saidclosure having integral individual radial projections molded underpressure into interlocking relation to said openings .and also having avertically and laterali wai-a @colder or dange at least part y opposedto said radial projections. Y

4 Signed at New York city, N. Y., this 5th day of? Angst, i919.

n* FRNK lBl. SHAW.

